In an alternate timeline, Captain Picard ordered the use of an inverse tachyon pulse in three different time periods, to scan the interior of an anti-time eruption which existed in each period. It was later discovered that the tachyon pulses themselves were what ruptured the subspace barrier between time and anti-time, creating the eruption in the first place. The timeline in which these events occurred was negated when Picard was able to stop the initial formation of the eruption. (TNG: "All Good Things...")

Later that year, temporal distortions, which existed as a result of Kes having traveled back in time from five years in the future, resulted in the presence of tachyon particles throughout Voyager. These particles caused LieutenantTuvok to experience a series of premonitions about the future, allowing the crew to prepare for Kes's arrival in five years time, and subsequently prevent her from traveling back in time in the first place. (VOY: "Fury")

In 2372, Lieutenant Torres attempted to use a sustained tachyon beam to penetrate and destroy the core of the "Dreadnought," a Cardassian missile which had been transported to the Delta Quadrant. The plan failed, however, when Dreadnought, which was equipped with a sophisticated artificial intelligence system, sent a plasma burst along the tachyon beam into Voyager's main power systems. (VOY: "Dreadnought")

Later in 2373, while trapped in an illusion created by an alien, Captain Janeway came to believe that she was being affected by a temporal anomaly, and attempted to use a tachyon burst to disperse it. (VOY: "Coda")

In 2375, When ColonelKira was kidnapped by Dukat from Deep Space 9, a scan of her quarters revealed traces of tachyon energy, leading the crew to realize that she had been beamed away. (DS9: "Covenant")

The same year, Captain Picard and Lieutenant Commander Worf were able to use a tachyon pulse to force Data, who was malfunctioning at the time, to remodulate the shield harmonics of the vessel he had stolen, so they could beam him aboard. Commander Data was later able to use the same tactic on a Son'a battle cruiser to make it possible for Worf to beam the crew to another ship. (Star Trek: Insurrection)

The MIDAS array directs a tachyon beam towards a pulsar

In 2376, Reginald Barclay came up with the idea of using the MIDAS array to direct a tachyon beam at a class-B itinerant pulsar, creating an artificial microwormhole through which two-way communication could be established with Voyager, on the other side of the galaxy. Although his superiors were initially skeptical that the plan would work, Barclay took the initiative to implement his plan, and was able to establish communication. Two years later, Harry Kim and Seven of Nine developed a method whereby Voyager could communicate with Starfleet in the Alpha Quadrant, by bouncing a phased tachyon beam off of a quantum singularity. This method of communication was limited by the fact that the singularity was only in alignment for eleven minutes every day. (VOY: "Author, Author", "Pathfinder")

That same year, Voyager encountered a unique planet in the Delta Quadrant, which had a tachyon core. The core created a spacetime differential between the planet and the surrounding space, the planet experiencing the passage of one day every 1.03 seconds as measured on Voyager. Voyager became trapped in orbit briefly due to the tachyon field generated by the planet, and remained in orbit for approximately one thousand years of the planet's time. (VOY: "Blink of an Eye")

Admiral Janeway using the chrono deflector to generate a tachyon pulse

In the year 2404, Kathryn Janeway, who by this time had returned with Voyager to the Alpha Quadrant and been promoted to admiral, appropriated a time travel device called a "chrono deflector," invented by a Klingon scientist named Korath. The device operated by generating a powerful tachyon pulse to form a temporal rift, which could then be directed to a specific time and place. Janeway used this device to travel to the Delta Quadrant, the year 2378, where she instructed her counterpart to initiate an antitachyon pulse in order to seal the rift. Due to the fact that the chrono deflector produced levels of tachyon radiation which would be toxic to her, before she left she instructed The Doctor to treat her with chronexaline, an experimental drug at the time which protected biomatter from tachyons. Admiral Janeway subsequently collaborated with the Voyager crew to change history and return the ship to the Alpha Quadrant sixteen years before it would have without her intervention. (VOY: "Endgame")